woocommerce/plugins/woocommerce-admin/client/stylesheets/_breakpoints.scss

/** @format */

// Breakpoints
// Forked from https://github.com/Automattic/wp-calypso/blob/46ae24d8800fb85da6acf057a640e60dac988a38/assets/stylesheets/shared/mixins/_breakpoints.scss

// Think very carefully before adding a new breakpoint.
// The list below is based on wp-admin's main breakpoints
$breakpoints: 320px, 400px, 600px, 782px, 960px, 1100px, 1365px;

@mixin breakpoint( $sizes... ) {
	@each $size in $sizes {
		@if type-of( $size ) == string {
			$approved-value: 0;
			@each $breakpoint in $breakpoints {
				$and-larger: '>' + $breakpoint;
				$and-smaller: '<' + $breakpoint;

				@if $size == $and-smaller {
					$approved-value: 1;
					@media (max-width: $breakpoint) {
						@content;
					}
				} @else {
					@if $size == $and-larger {
						$approved-value: 2;
						@media (min-width: $breakpoint + 1) {
							@content;
						}
					} @else {
						@each $breakpoint-end in $breakpoints {
							$range: $breakpoint + '-' + $breakpoint-end;
							@if $size == $range {
								$approved-value: 3;
								@media (min-width: $breakpoint + 1) and (max-width: $breakpoint-end) {
									@content;
								}
							}
						}
					}
				}
			}
			@if $approved-value == 0 {
				$sizes: '';
				@each $breakpoint in $breakpoints {
					$sizes: $sizes + ' ' + $breakpoint;
				}
				@warn "ERROR in breakpoint( #{ $size } ) : You can only use these sizes[ #{$sizes} ] using the following syntax [ <#{ nth( $breakpoints, 1 ) } >#{ nth( $breakpoints, 1 ) } #{ nth( $breakpoints, 1 ) }-#{ nth( $breakpoints, 2 ) } ]";
			}
		} @else {
			$sizes: '';
			@each $breakpoint in $breakpoints {
				$sizes: $sizes + ' ' + $breakpoint;
			}
			@error "ERROR in breakpoint( #{ $size } ) : Please wrap the breakpoint $size in parenthesis. You can use these sizes[ #{$sizes} ] using the following syntax [ <#{ nth( $breakpoints, 1 ) } >#{ nth( $breakpoints, 1 ) } #{ nth( $breakpoints, 1 ) }-#{ nth( $breakpoints, 2 ) } ]";
		}
	}
}